Make sure you have your Content-Type header set properly, if the API requires it. More
in the section below.

Note that if you're trying to POST to a form handler, you'll most probably want to send data
in multipart/form-data format, such as name=roger&hair=black. http-console sends your POST/PUT data as is,
so make sure you've got the format right, and the appropriate Content-Type header.

Because JSON is such a common data format, http-console has a way to automatically set
the Content-Type header to application/json. Just pass the --json option when
starting http-cosnole, or run the .json command: